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Aflati n stiind ca 2 n-1 divide pe 9

Răspuns :

[tex] D_{9} ={1,3,9}[/tex]
1 divide 9 ===>2n-1 divide 9 ===>n=1
3 divide 9 ===>2n-1 divide 9 ===>n=2
9 divide 9 ===>2n-1 divide 9 ===>n=5
n ∈ {1,2,5}